Because "the average score of Class Two is 7 points higher than that of Class One." So first of all, we must find out how many points the 30 students in Class Two are higher than the 30 students in Class One. 7*30=2 10

2 10 divided by the average of the total number of 70 in the two classes, you get 88 points. It can be found that each point of 2 10 gets 3 points, that is, 2 10/70=3.

The average score of class one students is 3 points less than that of all students, that is, 88-3=85.

The average score of class two students is 7 points higher than that of class one students, that is, 85+7=92.